Automatic drilling jig



July 16, 1940. W SMH-H y 2,208,480

AUTOMATIC DRILLING JIG Filed Sept. 24, 1938 Patented `July 16, 1940UNITED STATES PATENT, OFFICE 3 Claims.

This invention relates to automatic drill jigs and more particularly todrilling fixtures, and has for one of its objects the production of asimple and efficient means for quickly changing the different sizedbushings for drilling round shafts and the like.

A further object of this invention is the production of a drillingfixture, the various parts of which are adjustable, to facilitate theaccurate l() drilling of round shafts and the like.

Other objects and advantages of this invention will appear throughoutthe'following specification and claims. f i i In the drawing: Figure 1is a top plan view of the drilling lxture;

Figure 2 is a transverse sectional View taken on line 2-2 of Figure 1;

Figure 3 is a fragmentary longitudinal sectional View taken on line 3-3of Figure 1;

Figure 4 is a vertical sectional view taken on line 4-4 of Figure l; l

Figure 5 is a horizontal sectional view taken on line 5 5 of Figure 4.

By referring to the drawing, it will be seen that III designates thebase of the drilling iixture which is provided with a cut-out channel IIupon its upper face extending transversely thereof as shown in Figure 1,the side edges being undercut g() to provide dove-tail flanges ortrackways I2. A sliding platform I3 is slidably mounted within thechannel I| and is provided with beveled side edges I4 for slidablyengaging the overhanging dove-tail flanges I2. This platform I3 carriesa g5 plurality of upstanding studs I5 which are internally threaded forsupporting the standards I6, as shown in Figure 3. A slidable hanger IIis carried by the standards I6, the hanger II having circular collars I8at the ends thereof for o slidably fitting over the circular standards I6. A set screw I9 is carried by one of the collars I8, for engaging oneof the standards Iu for the purpose of locking the hanger I'I in avertically adjusted position.

A circular guide disc 20 is rotatably suspended under the hanger I'Iupon the journal pin 2|, which journal pin is secured to the hanger Il,as shown in Figures 2 and 3. This journal pin 2| is provided with athreaded end 22 to which the O guide disc 20 is secured, as shown. Thehanger II is provided with a plurality of apertures 23 arranged alongthe circumference of a circle which are adapted to register with thesockets 24 formed in the upper face of the disc 2i).l A lock pin 25 g5is adapted to fit into the apertures 23 and the sockets 24 for lockingthe disc 20 in a set posi-v tion with respect to the hanger I'I as willbe obvious by considering Figure 2. The disc 20 is provided with aplurality of aligned apertures 26 for receiving bushings through whichsuitable 5 drills of the conventional type are to pass as is common with.drilling fixtures of the type illustrated and described. Theseapertures 26 are in radial alignment with the apertures 23 formed in thehanger I'I and the'sockets 24 formed in the 10 disc 20, whereby theapertures 26 may be properly located over the Work as'will be obvious byconsidering Figure 1 when the pin 25 is placed in position for anchoringthe disc 2li in a set `position. From the foregoing description, it willbe l5 seen that the hanger Il may be adjusted vertically whereby thedrills may be properly positioned over the work and the disc 20 may beproperly rotated to bring the drills4 into proper position over thework. Furthermore, the sliding 20 platform I 3 may be adjusted towardand from the work as may be required. j

As will be obvious by considering Figures l and 4, the base I0 isprovided along one side edge with a longitudinally Yextending upwardlypro- 25 jecting dove-tail rib 27 upon which is slidably mounted forlongitudinal movement a standard 28, the standard.' being provided witha vertical slot 29 through which the anchoring bolt 3|] extends, theanchoring bolt 30 being carried bythe 30 chuck supporting arm 3| whichchuck supporting arm 3| is vertically slidable upon the standard 28through the medium of the dove-tail rib and channel formation 32, shownin Figure 1. The chuck supporting arm 3| comprises a projecting 35section 3|a and an anchoring section 3 |b pivotally connected by theanchoring bolt 30. The section 3|a is in this way swiveled upon thesection 3| b and is provided with `an index 3| having an anchoring pin3|d. This structure will permit a shaft to be drilled at any desiredangle and the pin 3|d may hold the index parallel to zero. A suitablework-engaging chuck 33 is carried by the arm 3| having a screw 34 forxing the chuck in a set position upon the arm 3|, the chuck 33 x5 beinggraduated in the conventional manner. A stop pin 35 is carried by thechuck 33. The chuck 33 is ofr the conventional type having three jawswith any desired type of sleeve to receive small pieces of work or smallchucks. The chuck 33 is 50- a conventional chuck and is made to conformto the standard threaded three-jaw universal or independent chuck andwith a taper inside to t a number of sleeves or a'Jacob chuck fordrilling small, studs, small shafts. and the like. The dove.- v

tail rib 21 is provided With a suitable index 211@il adjacent thereto. v

An upstanding longitudinally extending rib 36 is formed adjacent theforward edge of the base I0 and extends parallel tothe rib 21, the rib36 extending the full length of the base I0. This rib 36 is located in aposition so that its central longitudinal axis is directly below thecenter of the chuck 33, as shown in Figure Il, and also directly belowthe center of one of the apertures 26 When the same is brought directlyover the work and the anchoring pin 25 is placed in position, such as isindicated in Figure 1. A V-block 31 is located near one end of the rib36 for providing a rest for the work, and a V-block 38 is placed nearthe opposite end adjacent the chuck 33. The V-block 38 is provided wtiha releasable clamp 39 of an inverted U-shape type having a clampingscrew 40 of the conventional type, whereby the work may be rmly clampedin position, when desired.

It should be understood that the present ix` ture is adapted for quickchanging of different sized bushings for drilling round shafts. Thesliding platform I3 is provided with suitable graduations I3a along oneside edge to facilitate the proper adjustment of the platform whendesired, and the chuck 33 is also suitably graduated. Suitablegraduations may be located along one side of the rib 36 as indicated at36a. It should be understood that the discs may be replaced With anynumber of discs having different sized holes in the bushing or thehanger I1, and the hanger I1 may be adjusted vertically and tightened inposition for the desired adjustment. 'Ihe revolving disc 20 is for thepurpose of locating any number of holes in ashaft and the clamp 39 is inthe nature of an index head. This clamp is used for work only requiringone hole, so that the work may be firmly clamped in position. Thepurpose of the present device is to provide an automatic drill jig fordrilling the smallest size holes in shafts to the largest size with aquick way of changing the sizes merely by revolving the disc 20. Itshould be understood that any suitable types and sizes of drills may besupported upon the disc for this purpose.

What is claimed is:

l. A device of the character described comprising a base, an upstandingrib carried by said base, Work supports carried by said rib andshiftable along the same to set positions, said base being formed with arecess in its upper face having its inner end terminating at said riband its opposite sides undercut to provide undercut side Walls, a secondrib rising from said base at one side of said recess in spaced parallelrelation to the first rib, a platform in said recess slidably engagedwith the undercut side walls thereof and shiftable in the recess towardsand away from the inner end thereof, posts rising from said platformadjacent opposite sides thereof, a cross bar extending between saidposts and shiftable vertically thereon to adjusted positions, a bearingat the center of said cross bar formed with a vertical bore, a guidingdisk formed with drill-receiving passages about its peripheral portion,a stem screwed into a threaded socket formed centrallyof said disk andprojecting upwardly therefrom andv rotatably engaged through the bore ofsaid bearing, the bearing Abeing formed with circumferentially spacedopenings and the disk having sockets for registering with the openingsas the disk is turned to dispose a predetermined drill-receiving passageover the first rib in centered relation to- Work carried by the worksupports, a pin for passing through the registering openings and socketsto hold the disk in a set position; a block carried by the second riband shiftable along the same, a standard rising from said block andformed With a vertically extending slot and undercut groove; an arm, achuck carried by one end of said arm and extending over the rst riblongitudinally thereof for receiving and holding Work resting upon theWork supports; a head at the other end of said arm, a mounting slidablein the undercut groove; a stem loosely passing through said head andsaid mounting and having a threaded portion passing through the slot ofsaid standard, a securing nut carried by the threaded portion of saidstem for holding the mounting in a vertically adjusted position upon thestandard, a nut carried by said stern for holding the head thereon andpermitting turning to adjust said arm, and a set Screw carried by saidhead for engaging the mounting and holding the head stationary in a setposition.

2. A device of the character described comprising a base, an upstandingrib carried by said base, a second upstanding rib carried by said basein spaced .and substantially parallel relation to the first rib, worksupports carried by the first rib and shiftable along the same, a clampcarried by one support, a block carried by the second riband shiftablealong the same, a standard rising from said block and formed with avertically extending recess and a vertical slot intermediate the widthof the recess, an anchoring member shiftable vertically in the recess ofsaid standard, an arm having a head at one end, a bolt pivotallyconnectin g the head to said anchoring member and passing through saidslot to secure the anchoring member in a vertically adjusted position, afastener carried by the head for engaging the anchoring member andsecuring the arm in an angularly adjusted position, a chuck carried bysaid arm for engaging work carried by said supports, a platform carriedby said base and shiftable towards and away from the iirst rib betweenthe work supports, posts rising from said platform, a cross bar carriedby said posts and adjustable vertically thereon, a guide disk under saidcross bar having drill-receiving openings, a stem suspending said diskfrom said cross bar for rotary adjustment'to dispose a predeterminedopening of the disk over work carried by the work supports, and meansfor securing the disk in a set position.

3. A device of the character described comprising a base, work supportsshiftable along said base to positions in predetermined spaced relationto each other, a standard adjustably carried by said base for adjustmentparallel to the adjustment of said work supports, an arm adjustablycarried by said standard and projecting laterally therefrom in crossedrelation to one work support, a chuck carried by said arm. for engagingwork carried by said Work supports, a platform carried by said base andshiftable towards and away from work carried by the work supportsbetween the Work supports, posts rising from said platform, a cross barcarried by said posts .and adjustable vertically thereon, a hub at thecenter of said c-ross bar formed with a bore and openings surroundingthe bore, a stem journaled through said bore and having a collarengaging the under face of the hub and a threaded portion below thecollar, a guide disc under the 74 .cross bar having a hulov formed witha socket receiving the shoulder and a threaded opening receiving thethreaded lower portion of the stem to suspend the disk from the stem,said disk having its peripheral portion formed with drill-receivingopenings to be selectively disposed over Work by turning the disk aboutthe stem, sockets being formed in the hub of the disk to register withthe openings in the hub of the cross bar, and a fastener for engaging inregistering openings of the hubs to reieasably secure the disk in a setposition.

WILLIS SMITH.

